Note that nowhere does Eurocontol use the word autopilot.
Note that nowhere did I say that Eurocontrol does use the word autopilot.
However, in all aircraft I've flown in RVSM airspace, both the aircraft requirements, and the operator requirements demand that the autopilot be engaged while in RVSM, as part of RVSM certification.
Eurocontrol is not the be-all and end-all of RVSM airspace, and the world is somewhat bigger than Europe.
SNS3Guppy has tried to infer that "most operators do take that opportunity", but IMHO he is incorrect......most operators do NOT, and as posted here, some OM's/CP's positively discourage crews from flying with the A/P and A/T disengaged.
Perhaps most operators with which you are familiar discourage it. All operators with which I am familiar encourage it.